Improvement in machines for grinding and pplishing lenses



2 Sheets-Sheet- 1.

H. D. KNIGHT. v MAGEINB FOR GRINDING AND POLISHING LENSES, 6m.

N0. 109,325. Patented Nov.15,'1870.

Inventor Witnesses.

TH; uonms PETERS 0a., WASHZNGTDH, n. c.

2 Sheets-Sheet 2.

H. D; KNIGHT. MACHINE FOR GRINDING AND PULISHING LENSES, &c. No. 109,325.

Patented Nov: 15, 1870.

' Inventor dioitmi ini25 Lottcrs Patent No. 109,325, dated November 15. 1870.

lMPROVEHENT IN MACHINES FOR GRlNDlNG AND PQLISHlNG LENSES, 49cc.

no schedule refen'oc 1:0 in than Letter: Patant and making part at the some.

To all whom it may concern Bc it'known that I, Honsuo 1). Know, ol'Elgi-i,

I in the county of Kane and State of Illinois, have inrentedoncw and useful Improvement in Grinding-j jewelry, and for likc p urposes,n1nl consists of parts hereinafter more particularly set forth.

In the drawing which nccompanies and makes part of this specification, I have represented a convenient and practicable form of my machine, 0Whl0h-;

Figure 1 shows a view of n vertical section through the bendotockbn the swing-center, thc loft-hand part carrying the lap being in elevation Figure 2, a, plan view wi h the swing-cantor rcniovc'd,

showing the index on the slide in bedfnnd the slotted lower with its cam and movable fulcrum;

Figure 3, a pcrspectivo view of tho swing-center,

(dctacbedg with its hood-stock, index-wheel, and

.spring-stop,

' Figure 4, a bottom vicw'ol thc slotted lever, mom, and bands; and

Figure 5, a section of the slidc carrying mandrol and index-wheel, showing the spring-stop.

Tho bed or foundation of my machine, which may be of any suitable form or size, is represent-ed in the drawing at A A A v A, on tho left, cznrics a slidc head-stock, which is moved forward or backward by a; screw suitably ar ranged beneath. This head-stock supports in bearings the mandrel, which carriestho lap to, and has n pulicy, a, oiproper size and shape fixed upon it.

The bed A, on the right, is properly recessed to receive a slide-bod, a, tho forward end of which is provided with on open socket or slecvc l'.

Through this socket passes a closely fitted and strong pivot, c, which carries thc swinging bed (I. This swings in horizontal [)lonc.

It is hold at any given t ngle by a segmental index, 11, on the sliding bed, a small bolt, 0, fig. 5, being pressed down by the spring on the lcvcr e, to which it is attached, and passing into holes in the said index.

Upon this swinging bed is another slide hood-stock, E, fig. 3, carrying .n mandrel and fed forward in tho sumo manner as that bcl'orcdcscribcd,lbr the purpose of moving the point-of the chuck on tho cud of thc mandrel beyond the swing-cutter, thcrcbyclongating or shortening tho radius, and giving dlifcrcnt nrcs'ot' cnrvoturc. This mandrel is rcvolvcd in suitable bearmgr a policy fixed thereon, and has suitable chucks i'or holding the lens or stone to be ground.

it has also an index-whecl, f, the periphery of which d relin (in-c mmas to and from the lap.

in indented with holes ndnptcd to receive a stop on n spring-arm, f, as is clearly shown in fig. 5 of the drawing. It will be seen that this mandrel may be revolved by the pulley fixed upon it, or may he locked by the index-wheel and. its, appropriate stop. By means of the screw the head-stock may bc advanced any suitablc distance, carrying the chuck beyond the swingccnter as for as deslrcd,thercby changing the radius of the object to be ground. I

The socketed slide-bed a has been shown ns fitted to slide in tho fixed bed A, fig. 5, oorryin the manhis slide is moved by the swinging of the soclictcd bed, by tho mechanism shown chiefly in fig. 4. I

The pivot of the swinging bod passes q-nito through th socket, and is provided below with a pulley, g.

flhis'pulley is connected by stcclbzmds to another policy, 9', which is fixed on a short vcrticnlly-orwingcd pivot, It, in the outer extremity of the foundation A.

The bands are crossed, to give vcvcrsc motion to the outer policy.

. On the nppcr end of the pivot h is a coin, l, of any desired shape, to give suitnblc motion to the lover k.

This lover-has nrnis, It is, inclosing thc cam, and, at the other cud, o ring, inclosing the socket of tho sliding-bed.

The lever is slotted along its central part to admit of a, movable fulcrum, I, which is hldat any desired point by the thumb-screw.

The fulcrum is moved by means of the screw in. It will be seen that when the swinging bed moves upon its pivot, the outer pulley, g, is revolved through the stool band. thus turning the com on tho npp er end of pivot. I This cam is of such shape as to giro any do sii 'ed motion to the lever, through which the head-stock is cnused to advance or recc'do relatively to the swingccntcr. This motion, it is ovideniqmziy be increased by moving the fulcrum outward, or diminished by tho rcvcrso motion. The cani may he dctncbably fixed to thc'verticnl pivot, and any desired shape ofcom placed thereon, corresponding to the requirements of the figure to be ground. 'l ho clrnck may nlsobe changed for-tho purpose of holding lenses, or whatever other object I nmy be prcscntcdibr grinding.

When grinding facets, the indcx-wllcelon themondrel is locked by thcspring-cotcb, the holcs allowing the mandrel to be turned and fixed in any position,

Having thus fully dcscribcd my invent-ion, so that any one s illed in the art to which it appertcins may .bo'nblc to make und'nsc the some,

What I claim as now, and desire insecure by Let- ;tcrs Patent of the, United States, is-

*1. in a machine for grinding curved or faceted surfaces, a swing-center, c, in combination with a sliding hand-stock, E, mandrel, and xcv'ol ving lap, as set forth.

2. The swinning bed :1, carrying the sliding lies-1% cmm, vunset; form.

stock E and mandrel, when 'the parts are so arranged that the point of the chuck may be advanced hcyornl the swing-center, for the purpose set forth.

3. The swinging bed (I, carrying tho mandrel, whcn tho said had is moved forward will hnckward by the swinging motion, as set forth.

4. The socketed slide-bed 1:,cnrrying lho swinging bed, with its pinion, the said pinion being connected on cam for moving the sliding" bod through a lover.

5. -Lho steel hands, connecting the boilers g gfurmngcd as described, the outer carrying a cam of any desird form the cam operating'on the lover, as set forth.

6; ln'combination with the lever li, a, movable 1111- 5 7. The slotted lover I.-, constructed as. shown, and hchl by the movable fulcrum, as shown and described. 8. In combination with the sliding bell and swing ing hurl, the index f, as set forth.

Witnesses:

(J. M. DANIELS,

Gnoson E. Canons. 

